Q: Is 721,520 a Prime Number?
A: No, 721,520 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 721520 can be evenly divided by 1 2 4 5 8 10 16 20 29 40 58 80 116 145 232 290 311 464 580 622 1,160 1,244 1,555 2,320 2,488 3,110 4,976 6,220 9,019 12,440 18,038 24,880 36,076 45,095 72,152 90,190 144,304 180,380 360,760 and 721,520, with no remainder.
Since 721,520 cannot be divided by just 1 and 721,520, it is not a prime number.